| File Extension: | W31 |
| File Type Description: | Windows 3.1 Startup Data |
| File Type Developer: | Microsoft Corporation |
| Primary Associated Software: | Microsoft Windows 3.x |
| Primary Software Developer: | Microsoft Corporation |
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Release of the Microsoft Windows 3.x software program prompted the development of the Windows 3.1 Startup Data file type by Microsoft Corporation. Internal website statistics show that W31 files are most popular with users in United States and those running the Windows 10 operating system. Generally, we have found that most of these people are Google Chrome users.
 | Microsoft Windows 3.x by Microsoft Corporation |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .SDOC | Samsung Electronics | Data Files | Samsung Memo File |
| .PGM | Jef Poskanzer | Raster Image Files | Portable Gray Map Image |
| .M2A | Unknown Developer | Video Files | MPEG-1 Layer 2 Audio File |
| .HCW | Microsoft Corporation | Data Files | HTML Help Workshop Conversion Wizard Macro File |
| .BCD | Microsoft Corporation | System Files | Windows Boot Configuration Data File |
| .CSHTML | Microsoft Corporation | Web Files | ASP.Net Web Page |
| .ASCX | Microsoft Corporation | Web Files | ASP.NET User Control File |
| .MSN | Microsoft Corporation | Settings Files | Host Blocking File |
| .FL | Microsoft Corporation | Game Files | Freelancer Saved Game File |
| .U | Epic Games | Game Files | Unreal Tournament Class Package |
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